OK, they need to be honed out until the lip is visible no more. Then you can get a true measurement I know what all the books say to the max spec but, when this engine was new, the piston to bore clearance was tight and when I mean tight, less than 1 thou.

OK, they need to be honed out until the lip is visible no more. Then you can get a true measurement I know what all the books say to the max spec but, when this engine was new, the piston to bore clearance was tight and when I mean tight, less than 1 thou.

Checked the valves over tonight..looks like they and the guides will need replacing they failed on both the valve guide clearance and vertical run out measurements...by a large margin! doh! 😕 On a more positive note the springs are ok! 😊

Checked the valves over tonight..looks like they and the guides will need replacing they failed on both the valve guide clearance and vertical run out measurements...by a large margin! doh! 😕 On a more positive note the springs are ok! 😊

The valve face is pitted, this is down to the valve clearance being too tight. These will need re facing

Checked the valves over tonight..looks like they and the guides will need replacing they failed on both the valve guide clearance and vertical run out measurements...by a large margin! doh! 😕 On a more positive note the springs are ok! 😊

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The valve face is pitted, this is down to the valve clearance being too tight. These will need re facing

They will clean up but, if you have new valve guides fitted. The head needs to be about 300c in a oven and the guides need to be frozen to make fitting easy. The heat distorts the head a little so, a head skim and valve seats re ground. Not Cut

There is plug and play valve guilds on the market for modern heads. They come as a set, valves and guilds, even today there are valves on the market that are Teflon coated so, you can't even lap them in. This is all apart of the throwaway society and making engineers in to fitters. On these old girls, you should use the upgraded valve guides, that have oil seals on all. One of the best I have found are sets from Yamiya. These still need to be reamed with a Honda tool to spec.